11. Paul Kasey
You’ll definitely have seen Paul Kasey in one of his roles across Doctor Who, Torchwood or the Sarah-Jane Adventures, but you’d be hard pushed to recognize the actor as he’s always completely encased inside a monster suit as one of the Doctor’s alien foes.
Over the years he’s played Weevils, Judoon, Clockwork droids, Ood, Blowfish, Slitheen and Zygons, as well as appearing without prosthetics for a cameo in Peter Capaldi’s first full Doctor Who episode Deep Breath.
12. Nicholas Briggs
Perennial voice-of-Daleks Nicholas Briggs made a rare foray into live-action performing for Torchwood, playing slimy deputy Prime Minister Rick Yates in 2009’s Children of Earth.